EP0592584B1 - Dispositif servant a jauger le niveau d'un fluide - Google Patents

Dispositif servant a jauger le niveau d'un fluide Download PDF

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Publication number
EP0592584B1
EP0592584B1 EP92915228A EP92915228A EP0592584B1 EP 0592584 B1 EP0592584 B1 EP 0592584B1 EP 92915228 A EP92915228 A EP 92915228A EP 92915228 A EP92915228 A EP 92915228A EP 0592584 B1 EP0592584 B1 EP 0592584B1
Authority
EP
European Patent Office
Prior art keywords
waveguide section
waveguide
microwave signal
section
transmitter
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP92915228A
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German (de)
English (en)
Other versions
EP0592584A1 (fr
Inventor
Kurt Olof Edvardsson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Rosemount Tank Radar AB
Original Assignee
Saab Marine Electronics AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Saab Marine Electronics AB filed Critical Saab Marine Electronics AB
Publication of EP0592584A1 publication Critical patent/EP0592584A1/fr
Application granted granted Critical
Publication of EP0592584B1 publication Critical patent/EP0592584B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
    • G01S13/06—Systems determining position data of a target
    • G01S13/08—Systems for measuring distance only
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
    • G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
    • G01F23/284—Electromagnetic waves
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
    • G01S7/024—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00 using polarisation effects
    • G01S7/025—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00 using polarisation effects involving the transmission of linearly polarised waves
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
    • H01Q15/24—Polarising devices; Polarisation filters 

Definitions

  • the present invention relates to a device for gauging the level of a fluid, that is, a flowing or granulate material, contained preferably in a container, comprising a transmitter for the transmission of a polarizable microwave signal through a first waveguide section, a receiver for receiving a reflected microwave signal, an electronic unit, arranged to determine the reflex position of the reflected microwave signal and an antenna means with a second waveguide section.
  • Such devices have been used for a long time, operating in the radar wavelength area, and recently, devices with very high measuring accuracy (e.g. 0.01%) have entered the market.
  • Typical users of such equipment are oil refineries and petrochemical industry, where level gauging takes place in large tanks. In such applications numerous various antennae or corresponding tank adaptions are required, depending on the construction of the tank. However, it is much desired, that the same type of electronic unit with transmitter and receiver can be used in those different tank constructions.
  • the antenna means usually comprises a sealing function and must therefore be permanently installed, and is usually rather heavy. This means that a device of the kind mentioned in the introduction cannot meet all the contradictory demands mentioned above.
  • a device at a radar level gauge for gauging the level of a fluid in a container with a microwave signal.
  • the device comprises a vertical tube mounted in the container, and a transmitter, a receiver and an electronic unit for determining the level based on the reflex position of the microwave signal.
  • the device comprises a calibration device in the form of a polarization means for polarizing the microwave signal in two polarization planes separated from each other and at least one reflectance reactance in the tube, arranged to to give substantially stronger reflex of the microwave signal in the first polarization plane than in the second.
  • the device disclosed in WO/9009599 is designed for just one tank installation and only meets few of the demands mentioned above.
  • the object of this invention is therefore to achieve a device of the kind mentioned in the introduction, which in a simple way admits adaption to existing tank constructions with their various demands on the equipment in order that level gauging with high accuracy shall be achieved by using one and the same electronic unit.
  • the device shall also be inexpensive to acquire.
  • the invention is defined in the enclosed 1:st claim.
  • the waveguide modes mentioned are linearly polarized, mutually perpendicular.
  • the third waveguide section may be provided with a dielectric plate set at an angle of 45° to the extension plane of the transmitted microwave to achieve various elliptic polarizations, of which right and left turned circular polarizations are typical. Thereby, a double circular polarization of the microwave can be obtained, suitable for a horn antenna. At reflection in the measuring surface the circular polarization is switched (+ to - or - to +) and on re-entrance through the third waveguide section a perpendicular linear polarization is obtained.
  • the advantage is gained, that the portion of the transmitted microwave signal that is reflected against a wall is suppressed in that it is reflected one extra time and then gives a linear polarization in the transmitted polarization.
  • polarization of the third waveguide section is achieved with elliptic cross section or provided with internal ridges.
  • the third waveguide section comprises instead one or two plates of damping material, whereby the transmitted microwave signal is damped considerably (e.g. 20 dB) without the re-reflected signal being affected.
  • the third waveguide section replaces a ferite insulator but at a lower cost and with better environmental durability.
  • the transmitted microwave signal is damped, which means that leakage radiation is reduced to a corresponding degree, which may be a requirement if level gauging is effected entirely or partly in free space.
  • a perforated vertical tube is used as a waveguide in free space in tanks with so-called flowing roof.
  • the third waveguide section is provided with a damping plate, set at an angle of 45° to one extension plane of the transmitted microwave, a linearly polarized wave is obtained in only one polarization, which admits a thinner antenna lobe via for instance a parabol antenna.
  • the third waveguide section is arranged turnable relative to the first waveguide section, so that e.g. polarization of the microwave signal that comes from the transmitter can be changed by turning a stick in rigid connection with the waveguide section, without this having to be replaced.
  • the third waveguide section is empty internally in order to adapt a transmitted microwave signal to a diffuse surface, as is the case with a granulate material in said container, with simultaneous suppression of the echoe from the antenna means, it being symmetrically formed to the extension plane of either the transmitted or received signal.
  • Fig 1 in perspective and taken to pieces, shows a device according to the invention with four alternative antenna means and four alternative third waveguide sections.
  • Figure 3 shows, in perspective, a third waveguide section.
  • an electronic unit in combination with a transmitter and receiver of a microwave signal is designated by 1, and a first waveguide section connected thereto, by 2, which in its lower part is provided with a flange 3.
  • a horn antenna, intended to be connected to the flange 3 shows a corresponding flange 4, mounted in one end of a second waveguide section 5.
  • a third waveguide section 6 is shown in the form of a circular-cylindrical tube 7 with longitudinal ridges 8 arranged about the periphery, which are equally dispersed about the periphery save for a wider track 9 between two ridges to guide the tube.
  • the third waveguide section 6 is inserted into the first waveguide section 2 and is connected at the top to a waveguide connection 10 and at the bottom to a waveguide connection 11 at the second waveguide section 5 in the horn antenna.
  • the transmitter and receiver in this case are arranged respectively to transmit and receive microwave signals in a waveguide mode each, each linearly polarized, mutually perpendicular.
  • the third waveguide section 6 can now be equipped with various insertion parts according to need.
  • it can be provided with a plate of a dielectric material, set at an angle of 45° to the extension plane of the microwave signal that goes out from the transmitter and have such length that 90° phase difference is obtained. Thereby a double circular polarization is obtained of the microwave signal that goes out through the horn antenna.
  • the wavelength is adjusted according to the actual dimensions of the equipment, but is, for instance, in the range of about 3 cm.
  • the device will be used for gauging in free space it may be suitable to provide a third waveguide section 6 with at least a plate of a damping material, such as metal or an insulating plate covered with a thin metal layer, so that the outgoing microwave signal is damped according to need. The outgoing signal is then without the incoming signal being damped.
  • a damping material such as metal or an insulating plate covered with a thin metal layer
  • the third waveguide section 6 is equipped with a damping plate, set at an angle of 45° to the extension plane of the microwave signal that goes out from the transmitter. Thereby, as mentioned, a linearly polarized wave is obtained in only one polarization.
  • Fig 2a it is presented the cross section of a) a first waveguide section with the extension plane 12 for an outgoing microwave signal and the extension plane 13 for a received, reflected microwave signal.
  • a plate of a dielectric material is designated in Fig 2 b) by 14 and a plate of metal is designated in Fig 2 c) by 15.
  • a third waveguide section In case it is desirable to be able to vary polarization and damping in a third waveguide section, this can be effected as shown in Fig 2d by designation 16.
  • the waveguide section is turnable, for instance by being provided with a control stick 17' in the form of a ribbon attached at the lower part of the waveguide section.
  • a middle layer is provided between the flanges 3 and 4, so that the waveguide section after insertion in the first waveguide section 2 can be turned.
  • a cross section of this embodiment is shown in Fig 2 d).
  • the wide track 9 in the third waveguide section 6 corresponds to a pin in the first waveguide section 2 so that the mutual turning position between the first and third waveguide sections which is turnable the pin is removed (not shown in the figure).
  • Fig 3 it is shown by dashed line an embodiment of a damping plate in a third waveguide section.
  • the third waveguide section is empty internally as is evident from Figure 2 e) in order to adjust a transmitted microwave signal to a diffuse surface, which occurs in a granulate material, the level of which shall be gauged, with simultaneous suppression of the echoe from the antenna means.
  • the antenna means is here designed with a second waveguide section 23 in the form of a cone, with a metal mirror 24 set at an angle of 45°, arranged symmetrically to the extension plane of either the transmitted or received microwave signal.
  • the third waveguide section in case the first waveguide section 2 must be set at right angles to the lobe direction of an antenna, an embodiment of the third waveguide section, as presented by the designation 17, can be used.
  • This waveguide section is at the bottom provided with threads 18, corresponding to those in a sleeve 19 in connection with a second waveguide 20 in an antenna means 21.
  • the waveguide section 17 is inserted as described above into the first waveguide section 2, after having been screwed into the sleeve 19.
  • the antenna means 21 is then attached to the flange 3 with fastening means, not shown in the figure.
  • the antenna means 21 in this case is connected to a vertical tube located in a tank, functioning as a waveguide, which means that the waveguide section 17, the first waveguide section 2 and the electronic unit 1 are located with their symmetry axes being horizontal.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Remote Sensing (AREA)
  • Radar, Positioning & Navigation (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Electromagnetism (AREA)
  • Fluid Mechanics (AREA)
  • Thermal Sciences (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
  • Quick-Acting Or Multi-Walled Pipe Joints (AREA)
  • Waveguide Aerials (AREA)
  • Aerials With Secondary Devices (AREA)

Abstract

On décrit un dispositif permettant de jauger le niveau d'un fluide dans un récipient. Le dispositif comprend un émetteur servant à émettre, à travers une première section de guide d'ondes, un signal en hyperfréquence pouvant être polarisé, un récepteur servant à recevoir un signal en hyperfréquence réfléchi, une unité électronique déterminant la position réfléchie du signal en hyperfréquence réfléchi, et une antenne comprenant une seconde section de guide d'ondes. Le dispositif se caractérise principalement en ce que l'émetteur et le récepteur transmettent et reçoivent chacun respectivement un mode de guide d'onde, ces modes étant réciproquement orthogonaux, et en ce qu'une troisième section de guide d'ondes (6, 16, 17) est introduite entre la première (2) et la seconde (5) section de guide d'ondes et est pourvue d'éléments (12, 14, 15, 22) de polarisation et/ou d'amortissement permettant l'adaptation optimale du dispositif à différents récipients et antennes.

Claims (7)

  1. Dispositif servant à jauger le niveau d'un fluide ou d'un matériau granulaire contenu dans un récipient, comprenant
    - un émetteur (1) conçu pour émettre un signal de micro-onde polarisable via une première section formant guide d'ondes (2),
    - une deuxième section formant guide d'ondes (5) ayant un moyen formant antenne monté sur elle, conçu pour diriger ledit signal de micro-onde vers la surface du matériau à jauger,
    - une troisième section formant guide d'ondes (6, 16, 17) disposée entre les première et deuxièmes sections formant guide d'ondes, ladite troisième section étant pourvue d'un moyen conçu pour agir sur le signal de micro-onde par une polarisation et/ou un amortissement,
    - un récepteur conçu pour recevoir le signal de micro-onde après la réflexion depuis la surface du matériau et un passage de retour au travers des deuxième, troisième et première sections forrnant guide d'ondes, et une unité électronique conçue pour déterminer la distance entre la surface de réflexion et une partie définie dudit dispositif,
    - dans lequel l'émetteur et le récepteur sont agencés respectivement pour émettre et recevoir des signaux de micro-onde en des modes de guide d'ondes séparés, qui sont mutuellement perpendiculaires, de manière à être mutuellement indépendants,
    - il est en outre également prévu au moins une deuxième section supplémentaire formant guide d'ondes, pourvue d'une antenne et au moins une troisième section supplémentaire formant guide d'ondes, ces sections supplémentaires ayant des caractéristiques d'affectation différentes des signaux de micro-onde à partir des deuxième et troisième sections mentionnées en premier,
    - la troisième section mentionnée en premier formant guide d'ondes et ladite deuxième section formant guide d'ondes pouvant être facilement retirées pour permettre un remplacement par ladite troisième ou deuxième section supplémentaire, respectivement, cette aptitude de remplacement permettant l'adaptation à différents récipients.
  2. Dispositif selon la revendication 1, caractérisé en ce que lesdits modes de guide d'ondes sont polarisés de façon linéaire, mutuellement perpendiculaire.
  3. Dispositif selon la revendication 1, caractérisé en ce que la troisième section formant guide d'ondes (6) est pourvue d'une plaque diélectrique placée en formant un angle de 45° avec le plan de prolongement du signal de micro-onde qui sort de l'émetteur, afin d'obtenir différentes polarisations elliptiques dont les polarisations circulaires orientées vers la droite et la gauche sont typiques.
  4. Dispositif selon la revendication 1 ou 2, caractérisé en ce que la troisième section formant guide d'ondes (6) est pourvue d'au moins une plaque (15) de matériau d'amortissement pour amortir le signal de micro-onde émis, mais non le signal reçu.
  5. Dispositif selon la revendication 4, caractérisé en ce que ladite plaque (15) de matériau d'amortissement est placée en formant un angle de 45° avec le plan de prolongement du signal de micro-onde émis, afin d'obtenir une polarisation linéaire.
  6. Dispositif selon la revendication 1 ou 2, caractérisé en ce que la troisième section formant guide d'ondes (16) est agencée de manière à pouvoir tourner par rapport à la première section formant guide d'ondes (2).
  7. Dispositif selon l'une quelconque des revendications 1 à 6, caractérisé en ce que la première section formant guide d'ondes (2) présente une section transversale de forme circulaire.
EP92915228A 1991-07-04 1992-06-26 Dispositif servant a jauger le niveau d'un fluide Expired - Lifetime EP0592584B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE9102087 1991-07-04
SE9102087A SE504682C2 (sv) 1991-07-04 1991-07-04 Anordning för mätning av nivån av ett i en behållare befintligt medium
PCT/SE1992/000486 WO1993001474A1 (fr) 1991-07-04 1992-06-26 Dispositif servant a jauger le niveau d'un fluide

Publications (2)

Publication Number Publication Date
EP0592584A1 EP0592584A1 (fr) 1994-04-20
EP0592584B1 true EP0592584B1 (fr) 1997-01-02

Family

ID=20383255

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92915228A Expired - Lifetime EP0592584B1 (fr) 1991-07-04 1992-06-26 Dispositif servant a jauger le niveau d'un fluide

Country Status (13)

Country Link
US (1) US5543720A (fr)
EP (1) EP0592584B1 (fr)
JP (1) JP3030518B2 (fr)
AU (1) AU667478B2 (fr)
BR (1) BR9206241A (fr)
CA (1) CA2112691A1 (fr)
DE (1) DE69216407T2 (fr)
DK (1) DK0592584T3 (fr)
ES (1) ES2096090T3 (fr)
FI (1) FI940020A (fr)
NO (1) NO304667B1 (fr)
SE (1) SE504682C2 (fr)
WO (1) WO1993001474A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10049995A1 (de) * 2000-10-10 2002-04-11 Endress Hauser Gmbh Co Füllstandsmessgerät
US6759976B1 (en) * 2002-12-20 2004-07-06 Saab Marine Electronics Ab Method and apparatus for radar-based level gauging
DE102005057094A1 (de) * 2005-11-30 2007-06-06 Vega Grieshaber Kg Füllstandradar mit variabler Sendeleistung

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US7264944B1 (en) 1989-04-21 2007-09-04 Amgen Inc. TNF receptors, TNF binding proteins and DNAs coding for them
CA2290906C (fr) * 1991-06-06 2003-04-01 Stichting Centraal Diergeneeskundig Instituut Agent causal de la maladie mysterieuse du porc, compositions pour la vaccination et trousses diagnostiques
DE4336494C2 (de) * 1993-10-26 1995-11-02 Endress Hauser Gmbh Co Vorrichtung zur Füllstandsmessung in Behältern
US5614831A (en) * 1995-02-13 1997-03-25 Saab Marine Electronics Ab Method and apparatus for level gauging using radar in floating roof tanks
EP0947812A1 (fr) * 1998-03-28 1999-10-06 Endress + Hauser GmbH + Co. Capteur du niveau à microondes
EP1126251A3 (fr) * 2000-02-17 2002-05-29 Endress + Hauser GmbH + Co. KG Dispositif de mesure du niveau
US7819003B2 (en) * 2002-06-11 2010-10-26 Intelligent Technologies International, Inc. Remote monitoring of fluid storage tanks
US6853227B2 (en) 2001-04-17 2005-02-08 K-Tek Corporation Controller for generating a periodic signal with an adjustable duty cycle
US6504409B1 (en) 2001-04-17 2003-01-07 K-Tek Corporation Controller for generating a periodic signal with an adjustable duty cycle
SE0102881D0 (sv) * 2001-08-30 2001-08-30 Saab Marine Electronics Radarnivåmätare
US8994546B2 (en) * 2002-06-11 2015-03-31 Intelligent Technologies International, Inc. Remote monitoring of material storage containers
US20080250869A1 (en) * 2002-06-11 2008-10-16 Intelligent Technologies International, Inc. Remote Monitoring of Fluid Pipelines
US6759977B1 (en) 2002-12-20 2004-07-06 Saab Marine Electronics Ab Method and apparatus for radar-based level gauging
EP1431723B1 (fr) * 2002-12-20 2016-03-09 Rosemount Tank Radar AB Procédé et appareil pour mesurer le niveau par radar
US6987481B2 (en) 2003-04-25 2006-01-17 Vega Grieshaber Kg Radar filling level measurement using circularly polarized waves
US7106247B2 (en) * 2003-10-20 2006-09-12 Saab Rosemount Tank Radar Ab Radar level gauge with antenna arrangement for improved radar level gauging
WO2005038412A1 (fr) * 2003-10-20 2005-04-28 Saab Rosemount Tank Radar Ab Jauge de niveau a radar comportant un dispositif d'antenne et permettant un jaugeage ameliore
US6988404B2 (en) 2003-12-11 2006-01-24 Ohmart/Vega Corporation Apparatus for use in measuring fluid levels
DE102005031667A1 (de) * 2005-07-05 2007-01-18 Endress + Hauser Gmbh + Co. Kg Verfahren zur Ermittlung und Überwachung des Füllstands eines Mediums in einem Behälter nach der Laufzeitmessmethode
US7265558B1 (en) 2006-10-05 2007-09-04 Rosemount Tank Radar Ab Radar level gauge using elliptically or circularly polarized waves
US7701385B2 (en) * 2008-05-22 2010-04-20 Rosemount Tank Radar Ab Multi-channel radar level gauge system
US7924217B2 (en) * 2008-06-03 2011-04-12 Rosemount Tank Radar Ab High sensitivity frequency modulated radar level gauge system
DE102011075636A1 (de) * 2011-05-11 2012-11-15 Endress + Hauser Gmbh + Co. Kg Füllstandsmessgerät und Verfahren zur Ermittlung und Überwachung eines Füllstandes eines im Prozessraum eines Behälters befindlichen Mediums
US8970424B2 (en) * 2012-10-24 2015-03-03 Rosemount Tank Radar Ab Radar level gauge system with reduced antenna reflection
DE102018213435A1 (de) * 2018-08-09 2020-02-13 Vega Grieshaber Kg Multi-Band-Radar-Antennensystem
US10801873B2 (en) 2018-09-25 2020-10-13 Rosemount Tank Radar Ab System and method for determining level and density distribution
DE102018132285A1 (de) * 2018-12-14 2020-06-18 Endress+Hauser SE+Co. KG Füllstandsmessgerät

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JPS5263387A (en) * 1975-11-20 1977-05-25 Agency Of Ind Science & Technol Measurement of optical anisotropy of dielectric materials using microw aves
US4353041A (en) * 1979-12-05 1982-10-05 Ford Aerospace & Communications Corp. Selectable linear or circular polarization network
SE461179B (sv) * 1989-02-08 1990-01-15 Saab Marine Electronics Anordning foer maetning av nivaan av ett i en behaallare befintligt fluidum
US5351036A (en) * 1991-12-10 1994-09-27 Clark-Reliance Corporation Microwave-based point liquid level monitoring system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10049995A1 (de) * 2000-10-10 2002-04-11 Endress Hauser Gmbh Co Füllstandsmessgerät
US6759976B1 (en) * 2002-12-20 2004-07-06 Saab Marine Electronics Ab Method and apparatus for radar-based level gauging
DE102005057094A1 (de) * 2005-11-30 2007-06-06 Vega Grieshaber Kg Füllstandradar mit variabler Sendeleistung
DE102005057094B4 (de) * 2005-11-30 2013-02-14 Vega Grieshaber Kg Füllstandradar mit variabler Sendeleistung

Also Published As

Publication number Publication date
SE504682C2 (sv) 1997-04-07
AU2291492A (en) 1993-02-11
ES2096090T3 (es) 1997-03-01
SE9102087L (sv) 1993-01-05
NO940004D0 (no) 1994-01-03
SE9102087D0 (sv) 1991-07-04
JPH07500181A (ja) 1995-01-05
EP0592584A1 (fr) 1994-04-20
NO940004L (no) 1994-02-16
JP3030518B2 (ja) 2000-04-10
WO1993001474A1 (fr) 1993-01-21
DE69216407T2 (de) 1997-04-24
FI940020A0 (fi) 1994-01-04
CA2112691A1 (fr) 1993-01-05
FI940020A (fi) 1994-01-04
NO304667B1 (no) 1999-01-25
DK0592584T3 (da) 1997-05-26
AU667478B2 (en) 1996-03-28
US5543720A (en) 1996-08-06
DE69216407D1 (de) 1997-02-13
BR9206241A (pt) 1995-03-14

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